src/third_party/mozjs-45/js/src/jit-test/tests/collections/Map-iterator-proxies-2.js

// map.iterator() and iter.next() are non-generic but work on cross-compartment wrappers.

load(libdir + "asserts.js");
load(libdir + "eqArrayHelper.js");
load(libdir + "iteration.js");

var g = newGlobal();

var iterator_fn = Map.prototype[Symbol.iterator];
assertThrowsInstanceOf(function () { iterator_fn.call({}); }, TypeError);
assertThrowsInstanceOf(function () { iterator_fn.call(new Set()); }, TypeError);
var mapw = g.eval("new Map([['x', 1], ['y', 2]])");
assertEqArray(iterator_fn.call(mapw).next().value, ["x", 1]);

var next_fn = (new Map())[Symbol.iterator]().next;
assertThrowsInstanceOf(function () { next_fn.call({}); }, TypeError);
assertThrowsInstanceOf(function () { next_fn.call((new Set())[Symbol.iterator]()); }, TypeError);
var iterw = mapw[Symbol.iterator]();
assertEqArray(next_fn.call(iterw).value, ["x", 1]);
assertEqArray(next_fn.call(iterw).value, ["y", 2]);
assertEq(next_fn.call(iterw).done, true);